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Wetting and strength issues at Al/alpha-alumina interfaces [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2003.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
vp : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The wetting behavior and strength at aluminum/alumina interfaces has been an active subject of research. Al/alumina applications include ceramic-metal composites and several applications for electronic industries. In this paper the interface strength and microstructure of Al/alpha-alumina was investigated. We discovered that in a solid-state joining, the strength of the joint increases with increasing joining temperature. In a liquid-state joining, the strength of the joint gradually decreases due to the formation of unbonded areas. The strength, sigma sub b, is expressed by the following equation as a function of unbonded area, A: sigma sub b = 2.22 A + 143 (70 percent ≤ A ≤ 100 percent). The highest strength reached 400 MPa when the interface was formed at around the melting temperature of aluminum. An aluminum layer close to the interface became a single crystal when it was bonded to a sapphire. The following crystallographic orientation relationship is established: (1{bar 1}1){sub Al}//(001){sub α}-Al₂ O₃, (110){sub Al}//<100>{sub α}-Al₂O₃. Amorphous alumina islands were formed at the interface. In the amorphous alumina, gamma-alumina nanocrystals grew from the sapphire, with the same orientation relationship to sapphire as above.
Report Numbers
E 1.99:lbnl--52952
lbnl--52952
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Note
Published through SciTech Connect.
04/15/2003.
"lbnl--52952"
Journal of the European Ceramic Society 23 15 ISSN 0955-2219; JECSER FT
Suganuma, Katsuaki; Saiz, Eduardo; Tomsia, Antoni P.
21COE program. Ministry of Education Culture Sports Science and Technology (US)
Funding Information
AC03-76SF00098
502401
View MARC record | catkey: 14447615